9.18.7.1.(3)ATTRIBUTION:
Functional Statement:
F01
To minimize the risk of accidental ignition.
Objective:
OS1.1
APPLICATION:
Combustible ground cover in crawl spaces whose exterior walls have less than 25% of their total area
above exterior ground level open to the outdoors, that are under 1-storey portions of dwelling units and are used as warm-air plenums, in buildings to which Part 9 applies [see Sentence
1.3.3.3.(1) of Division A for application
of Part 9].
INTENT:
To limit the probability that debris, such as smouldering
cigarette butts, will fall through floor registers and lead to the ignition
of combustible materials in the crawl space plenum, which could lead to harm
to persons.